Abstract
Recent research at the National Institute for Petroleum and Energy Research (NIPER) into the design of a fast, accurate, and precise method to determine the liquid-phase enthalpy for organic compounds is discussed. The apparatus employed consists of a commercial Differential Scanning Calorimeter (DSC) and specially designed sample cells capable of withstanding both high temperature and pressure without rupture. Critical properties (T c,P c,ϱ c) derived from these measurements are also discussed. Results obtained for benzene and decane were used to validate the method. The temperatures at which conversion to a single phase occurs for several different cell fillings were used to map out the two-phase domain for each compound. Critical pressures were estimated via a simultaneous fit of available high-precision, low-pressure (p<3 bar) vapor pressures and two-phase heat capacities measured for several different cell fillings. Derived critical properties for both benzene and decane were in excellent agreement with literature values. The fitting procedure is described.
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